Improve the starting sentence
Update table of contents as a result of #bf63c4971d73e80739c9f2619a9fa0dfb2223435
Merge pull request #8219 from nikitug/threadsafe_xmlmini_with_backend

Make XmlMini.with_backend usable with threads

Conflicts:
	activesupport/CHANGELOG.md
Minor improvements & fixes
Minor improvements & fixes
Fix AS::Concern example (current example doesn't work)
Fix another AS::Concern example (class_eval is already called by included)
Update links to API documentation & add a TODO
Minor improvements & fixes
Some minor improvements
Add links to TryGit & official documentation
Merge pull request #8112 from rails/encrypted_cookies

Encrypted cookies
Switch to 1.9 hash syntax
Switch to 1.9 hash syntax plus minor fixes
Fix 'persons' to 'people' and add some whitespace
Switch to 1.9 hash syntax
Switch to 1.9 hash syntax
Properly align some example comments
Switch to 1.9 hash syntax
create fewer relation objects